Curved spirally-wound coil and method of producing the same



BEST AVMLASLE GGPE Aprii i3 192%.

H. A. SREMER CURVED SFIRALLY WOUND COIL AND METHOD OF PRODUCING THE SAME 2 SBeets-Sheet 1 Fil ed Feb. 16, 1925 April 13 ,1926.

H. A. BREMER CURVED SPIRALLY WOUND COIL AND METHOD OF PRODUCING THE SAME 2 Sheets-Sheet 2 Filed Feb. 16 1925 I iii W726?" -tion..

, BESTAVAlLAB LE COP:

Patented Apr. 13, 1926. I i

UNITED. STATES PATENT or icE.

nanny A. BBELQIER, or CHICAGO, ILLINOIS, nssreuon T BREKEn-ii'ULLY MANU- FACTURING COMPANY, or CHICAGO, ILLINOIS, A CORPORATION or ILLINOIS.

' QULQVEIJ SPIRALLZ-WOUND 0011. AND METHOD 0i PRODUCING THE SAME. Application filed February 16, 1925. Serial No. 9,8.

To whom,- it 71-111. comm; view. illustrating another element of the collie it known that I, HARRY A. Bnmnzn, a lapsihle mandrel: Fig. 7 is a sectional'view cit zen of the United States, residing at on line 77 of Fig. 4; Fig. 8 is a diagram- 'Chicag", 1n the, county of Cook and the matic view illustrating steps in the method State of Illinois, have invented a certain of my invention: Fig. 9 is anotherdiagramno :new and useful Improvement in Curved matic View illustrating the concluding step Spn-ally-ll'wuul Coils and Methods of Proin the method of my invention; and Fig. 10

'-.'..ducing the Same. of which-the following is still another diagrammatic view.illusis a full, clear, concise, and exact descriptrating a detail of formation of the coil.

v v v The mandrel illustrated comprises jfour My invention relates to curved spirally straight rectangular blocks 1," 2, 3 and 4, igwonnd or toroidal coils and a method of which are held in expanded relation '0 producing the same. means of a cross 5 in the corners of whic i :ZSuch coils when'made of wire are comthese blocks are seated. The blocks. may

15 monly employed in the-,galectrical art. though he provided with grooves 6, 7, leining a the invention is not- '16 be limited to the spiral pathway for the wire. The wire ilualurc oflhe thread employed in producing lustratcd'includes the metallic core or wire the coils. I proper 8 covered by insulation 9. The wire The method of my invention consists in is initially spirally turned upon the straight I 20 spirally winding the thread into a coil rcmandrel into a straight coil, whereafter the quiring bending into the desired shape, ascross 5 is withdrawn to permit the mandrel sembling slack folds of ligature'at their ends to collapse preparatory to'withdrawing the with com'olutions of the coihoutsidc of the coil therefrom. Ligatures 10 are placed upcoil side that is to become the inner side on the top side of the mandrel sections 1 25 of the coil in its final shape and of aggregate and 2, these ligatures being preferably tape length limiting the extent to which the coil like in form and cemented to the inulation may be bent, and curving the coil. 9 by means of collodion or other suitable The product of my '-invention, in one adhesive. ,Sinilar ligatures 11 are placed aspect, is a coil of spirally wound thread upon the top sides of theportions of the in combination with ligature portions conc-onvolutions that are upon the mandrel-- nected with and stretched between convolusections 1 and 2, theseligatures being simi- K tions of the coil and located outside of the larly assembled withthe insulation that is inner side of the coil. disposed about the wire. These. ligatures In another aspect of my invention the 10 and 114m: thus res ctively upon the in- 36 innermost portions of adjacent convolutions ner and outer sides 0 the coil wire that is :of the coil contact and are in staggered relasandwiched between the ligatures. Initialtion in the plane of the coil whereby the ly the ligaturs are sinuousin' form, the asamount of wire within a given winding sembly of the ligatures' with the adjacent space may be increased without unduly inwire conviolutions being etl'ected. between creasing the dimensions of the coil. the folds of the ligatures. Afterth coil s 5 My invention will be more fully explained withdrawn from the mandrel the coil is in connection with the accom anying drawcurved with the ligatures ontside. of the mings in which F ig. 1 is a" ace view of a ner sideofthebent coil, ddi'ese hgatures toroidal coil made in accordancewith the ing preferably at the extreme outer side of 45 preferred embodiment of my invention, the coil.. The convolutions are of a length, some of theconvolutions being shown in when stretched, .coincidmgwith the length/ section; Fig. 2 is a sectional view on line of the curve of thefinally shaped coil where 2-2 of Fig. 1; Fig. 3 illustrates a portion the ligatures are disposed so'that the extent of a' collapsible mandrel and-a part of a. to which the coil is curved is limited. The

coil wound thereon, this figure illustrating folds in the sinuous ligaments aredesirably some of the steps in the method of my inof equal extent so that the what-cut convention; Fig. 4 is an end View of the parts volutions are equally spaced apart when the shown in Fig. 3; Fig. 5 isa perspective view coil is curved to the extent rmitted by the illustrating one of the elements of the colligature portions that then come stretched lapsible mandrel; Fig. 6 is a,.perspective between the adjacent wire convolutions with 0 BEST AVAlLABLE COP\ which these ligature portions are connected. The result is a coil of toroidal form with the eonvolutions thereof evenly spaced apart.

In order that as many convolutions of wire in a single spiral as possible may be contained in the winding space afforded, the wire receiving groves in the mandrel are sodisposed that the innermost portions of adjacent convolutions of the coil, when the coil is finally curved, contact and are in staggered relation in the plane of the coil as illustrated most clearly in Figs. 8, f) and 10. Another ligature 12 ispreferably laid upon the lower end of the cross 5 as illustrated in Fig. 4, and is similarly treated with eollodion so that it may adhere to the convolutions of the wire at the inner side of the coil to maintain the inner side of the coil in" shape.

Changes may be madenithout departing from my invention.

Having thus described my invention, I claim 1. The method of making curved coils of wire which consists in spirally winding the wire into a coil requiring bending into the desired shape; assembling a sinuous ligature with and with its folds between conrolutions of the coil and along one side of thee-oil and of a. length, when stretched, coinciding with the length of the curve of the spiraUy shaped coil where the ligature s disposed: and curving the coil with the ligature outside of the inner sideof the bent coil. T

The method of making curved coils of wire which consists in spirally winding the wire into avcoil requiring bending into the desired shape; assembling slack folds of ligature with and between convolutions of the coil at places outside of the coil sidethat is to become the inner side of the coil in its final shape and of aggregate length limitmg the extent to which the coil may be bent;

and curving the coil.

In witness whereof, I hereunto subscribemy name.

HARRY A. BREMERL 

